Showing posts with label Sony. Show all posts
Showing posts with label Sony. Show all posts

Tuesday, March 20, 2018

What Makes a Projector? -LCD

Last time we spoke I talked about what a DLP Video Projector is.  How it works as well as its Pros and Cons.  From this point forward, I will be discussing what makes another large segment of the projector market, LCD Projectors.

LCD (Liquid Crystal Display) is a subtraction display technology versus DLP, additive display technology.  DLP Adds layers of colors to make an image where as LCD blocks pixels to take away color for dark area.  One is not better than the other. One of the main advantages of LCD is the lack of a color wheel.  This means one of DLP's main detriments(rainbowing) is not a concern.  LCD uses 3 colored filters to break the light into Red, Green and Blue.  These are then re-combined before final projection.

LCD Projectors were the first projectors on the market.  They quickly replaced the older and antiquated CRT (cathode ray tube) Projectors.  Their portable size and surprisingly bright image( for the time) was a welcome change.
You would think this type of technology was rather new, but in reality its almost 35 years old.  The first 'Light Valve' was pioneered in 1968 at RCA by John van Raalte.  It took until 1984 for him to work out the issues such as being able to control the 'light valves' in a meaningful way for a projector.  Since each pixel is arranged in a grid pattern, there needs to be a way to address each pixel.  This also showed the first use of negating the 'screen door affect' of each pixel being too obvious and looking like a grid of color.

It wasn't until the mid to late 1990s that LCD computer projectors became more common place. Before then, the most common form of LCD projector was a flat panel that was set atop a common overhead projector.

Once the LCD digital projector became common place it rapidly advanced.  At first the contrast was an issue at low brightness's.  The implementation of an auto iris resolved that.  This Iris physically blocks the lamps light beam at a specific level to balance the light needed to display the color required by the video.

Both LCD and DLP Projectors use lamps and lenses. Everything in between is quite different.
The lamp in an LCD projector starts off by focusing its light through a lens in the front of the lamp. This lens ensures the maximum amount of light hits the first lens of the projector.  The lens ' job is to focus the lamp light onto the the next piece of glass which is a color prism.  This prism reduces the light to its core colors of Red, Green and Blue.  The now filtered light is passed through a set of mirrors and multiple Dichroic filters.

The 3 filters further filter the lights to single color channels. Each of the 3 core colors have their own light path and their own LCD panel. Directly prior to passing through the LCD panel the light is balanced by 2 polarized glass panels.  These are adjusted in the factory so that each color is of equal intensity. This is critical because once the light passes through the LCD panel it is now 1/3 of the picture.  It is combined with the other 2 colors to form the full color image.  If any of the 3 colors are more dim or bright than each other, the image will look out of balance and not vivid.
The Lamp in an LCD projector is different as well.  The lamps usually have an optical lens rather than a filter lens as in a DLP lamp.  There is no need to block the UV and IR as it leaved the lamp.  The UV is already blocked by the glass, but the IR is not going to affect a color wheel so it can be filtered out after it leaves the lamp.

At one point around 2010 DLP projectors were surpassing LCD in quality but now the differences can be minuscule in the image quality.  LCD is still quite popular and posses a slightly large part of the home theater market but only barely.

Either projector can serve you well for most purposes.  Once type of lamp is not necessarily more expensive either.  Ideally you want to look at the picture.

If the image looks how you want it to look then LCD is the right technology for your home theater.  Maybe DLP looks better since it does have slightly deeper colors?  At that point it is up to your personal preference.   Be sure to follow us for our next post where I will discuss the other types of display technology such as LCOS and DiLA.

No matter which you choose you can get your lamp from us with the confidence that you are purchasing from a company who knows lamps.

Tuesday, November 14, 2017

What to Do if Your Lamp Stops Working...

...or if your new lamp does not work read these to see if they can help you.

I installed my lamp and now it won’t turn on. Do I have a defective lamp?

There are a few things to check before contacting customer service that may rectify the situation.
·         Make sure your projector is plugged back in.
·         Is the lamp cover fully secured back into place? The projector will not turn on unless it recognizes this access door is closed.
·         It is always best to unplug the unit when replacing the lamp, so make sure it’s properly plugged into a good power outlet. Maybe unplug and re-plug in the projector to be sure.


My projector is plugged in, but I still am not getting light!

     Listen to the projector when you turn it on.  You should hear the exhaust fans after you press the power button for at least a few minutes while the unit tries to start the lamp.  If you do not hear the fans, it could be an indication that the lamp is not seated properly or the lamp access cover is not secure.  Remove and re-install the lamp and carefully replace the lamp cover.  If you still cannot hear any fans, check your power cord and then check to see if there are indicator lights flashing on the projector.
   If you can hear the fans running and there is still no picture, check for any flashing/solid indicator lights on the projector. These lights are how the unit tells us what is going on within the projector, and has a corresponding reference in the owner’s manual.
  Every projector has an owner’s manual available on line for free.  Check the flashing indicator lights against the description in the owner’s manual.  If the description points to a failed lamp, please contact our Customer Service for further assistance.


My lamp is projecting a picture, but I have a message telling me to replace the lamp.  This is a new lamp, why is it saying that?

     Most Projectors have a Lamp Hour Counter or Lamp Timer to keep track of lamp usage.  The units are designed to warn you when the lamp is approaching the end of its life.  When a new lamp is installed, you must manually reset the timer or the projector will not know the lamp has been changed and will count an incorrect amount of hours.  This also means that if you prematurely reset the timer, you will not have a proper hour count on the replacement lamp once installed.  Some projectors will turn off completely and need to be manually reset before they will turn on if the lamp hours are exceeded beyond the factory settings.
- It is always a good idea to check the manual and reset the timer as instructed.



My projector is much dimmer than I would expect with a new bulb. Do I need to send it back?

     Check to make sure the bulb is installed flush with the front of the housing.  It should sit exactly as the old bulb and must be installed the same way or the light will not illuminate the image correctly. Should the bulb be slightly off center, or not aligned correctly the image can be dim, and you will need to contact PurelandSupply for a Return Authorization (RA) Form.


My projector turns on for a few minutes and turns off after installing the new lamp.

     While this could be a defective lamp, it is common for many Projectors to turn themselves off when there is another issue.  Many times the fans will be dusty and not spin correctly.  That will cause the projector to shut down.  Try cleaning the projector with a vacuum to make sure as much dust and dirt is cleaned up as possible.


I installed the lamp and my projector is telling me that it is getting too hot.

     Anytime you replace your lamp, it is a good idea to clean the unit for dust.  Heat is the primary cause of early lamp failure.  By keeping your TV/Projector clear of dust, you will help it keep the lamp at a proper temperature.  While the lamp is out, use a vacuum cleaner to collect any dust from the lamp compartment and the vents so that it does not re-collect in the TV/Projector.
     This is recommended to be done at least when the lamp is changed, but once every 3-4 months is even better.  With proper maintenance of the TV/Projector, the longer it will last.


I received my lamp but it is not the same as the one I removed.

     It is very rare that there can be multiple lamps for a Projector.  Occasionally the manufacturer will switch lamps mid production, which can be confusing and frustrating. This can be resolved very easily with some help from you.  Record any numbers on the lamp/bulb.  Also verify your model # as well as any letters before or after the model number.  Contact our customer service with the information from your old lamp/bulb and we can correct your order and have the issue taken care of.


My projector has a new lamp, but the color of the screen is still wrong.  I see colors where they shouldn’t be and the picture is either flickering or off color completely. Is my lamp defective?

     Our lamps only project a bright white light.  Your Projector processes the color control by shining the white light thought either a color wheel for DLP or LCD panels for LCD units.  The color can only be affected by the internal optics of the projector.  Generally an off color display will not be noticed with an older lamp as it is not operating at full power. With a new lamp, it will be brighter and show any issues that may have been there previously with a lot more clarity.  A new lamp will NOT resolve this as the issue is with the internal optics.
           

I do not see the answer to my issue.  Is there anyone I can talk to?


     We are always available to help! Please contact us at 1-800-664-6671 Mon-Fri 9:00am-5:00PM and speak with one of our associates. You can also email support@purelandsupply.com or sales@purelandsupply.com, and we will be happy to answer any question you may have. 

Brands we sell continued...

Pureland Supply only sells the highest quality lamps. Our lamps are aftermarket housings engineered to fit the same as the OEM from the manufacturer. 

The brands we carry are:

Acer
Ask
Barco
BenQ
Boxlight
Canon
Christie
Dell
Digital Projection
Dukane
Eiki
Epson
Hewlett Packard
Hitachi
IBM
Infocus
JVC
Knoll
LG
Liesegang
Marantz
Mitsubishi
NEC
Optoma
Panasonic
Philips
Planar
Plus
Projection Design
Proxima
RCA
Runco
Samsung
Samsung
Sanyo
Sharp
Sim2
SmartBoard   
Sony
Toshiba
Ushio
Vidikron
Viewsonic
Vivitek

Contact us Today at www.PurelandSupply.com or give a call and speak to a real person instead of a recording. We are here 9-5 Eastern Standard time. You can also email us at Sales@PurelandSupply.com